I was considering Raspberry Pi, but after adding all the costs, it seemed to go beyond the 'low cost' price tag.
Of course, the advantage is the low power consumption (around 3-4 W) and it is best to use it for downloading in that sense.
I have an old laptop kept mainly for downloading which I can retire if Rpi can replace it for torrents with scheduling included and ability to write 4GB+ on NTFS partitions.
Since I do not have a dedicated media hard disk at the moment, I thought of adding one portable 1 TB hard drive (around 4K) to this device. I could use our Samsung Note 10.1 charger (2Amp) if it works with Rpi. It does not work with my Motorola phone somehow.
Also, I heard there is no way to turn off the hard disk safely because there is no ON/ OFF button on the Rpi. So there is a high chance of corrupting the data on the USB HDD. You will have to log on to the Linux console to do a shutdown safely everytime.
I am not saying the device is bad, but there are lot of changes one needs to make to get the best out of this tiny device.
Also about the SD card, isn't it true that if you have large BD rips, you will need lot of space on the SD card (min 16GB) to do some transcoding during playback?
You should create a separate thread to share your experiences on this so that all of us can learn more.